Speed-indicator.



D. MILLER.

SPEED INDICATOR.

'APPLIOATION FILED JUNE 29, 1907.

Patented Jan. 19, 1909.

v 2 SHEETS-SHEET 1.

D. MILLER.

SPEED INDICATOR.

APPLIGATIONI'ILED JUNE29,1SJO'7.

Patented Jan. 19, 1909.

2 SHEETS-SHEET 2.

I '1 1 71.1 I .IEHL'HV szl dud nzzzzzzi UNITED STATES PATENT OFFIQE...

DORR MILLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO MCCORD dz COMPANY, .OF CHICAGO ILLINOIS, A CORPORATION OF NEW JERSEY.

SPEED-DTDICATOR.

Specification of Letters Patent.

Patented Jan. 19, 1.909.

To all whom it may concern:

Be it known that I, DORR MILLER, a citizen of the United States, residing at Chicago, in

. therein'to'the accompanying drawing.

the dial and pointer.

My invention relates to speed indicators and especially to a new and im roved form employing a liquid ina closed 0 amber and subjected to pressure b mechanism in the chamber, by means of w rich the speed of rotation, as of an axle or shaft, is measured and indicatedon a dial, and has reference particularly to. such devices for determining the rate of travel of automobiles.

The invention consists in the constructions and arrangements of the parts hereinafter described and then set out in the appended claims.

In the accompanying drawings in which the same reference numerals refer to like parts-Figure 1 is a side view of a device emodyin'g my invention; rig2'2 is a central longitudinal sectional view; Fig. 3 is a sectional view on the line 3-3 of big. 2; Fig. 4 is a view partly in elevation and partly in crosssection on the line 44 of Fig. 2; Fig. 5 is aview in elevation of the cup; Fig. 6 is an end view looking into the cup, parts being broken away; Fig. 7 is a detail view of the shaft and arm, and Fig. 8 is a front view of Acylindrical metal casing lO providing a chamber is internally'threaded at its open end to receive the threads on the head 11 which when screwed in the casing completely closes the same and prevents the escape of the oil or other suitable liquid with which it is filled. 'lhehead is recessed at 12 to provide a bearing for one end of the driving shaft 13, and carries an annulus 14 secured to the inner face thereof. 'lhc other end of the shaft passes through the closed end of the casing and a sleeve 15 which is in tegral therewith and internally threaded to receive a screw plug 16, forming a stuffing box. The plug is roamed out to provide a bearing for the shaft which passes therethrough and maybe connected in any suitable manner withthe axle of amautomobile or other vehicle whose speed it may be desired toindicate. 'lhe sleeve is of greater diameter than the shaft and is filled with suitable packing which surrounds the shaft and when the plug is screwed in prevents the escape ofthe oil from .the cylinder.

'lhe shaft carries collars 17 and 18 secured thereto, the latter bearing against the inner face of the end of the chamber to prevent the shaft from being drawn therethrough and serves also to hold it seated in the recess 12 An arm 19 secured to the collar 17 projects at a right angle to the shaft and has a finger 20 which lies in a plane parallel with the shaft but isangularly or obliquely disposed to said shaft, as shown in big. 7. The finger is adapted to engage a roller 21 pivoted to the inner surface of acup 22, of less diameter than the annulus, and comprising a cylindrical portion 23 and a dome or hemispherical portion 24. The cup is adapted to telescope with the annulus which with the head acts as a cap and serves to close it. A spider 25 secured to the open end of the cup is centrally reamed out to provide a suitable opening 26 which together with a similaropening 27 in the apex of the dome provide bearings for the cup on the shaft 13 on which the cup ;is adapted to be revolved and moved there along in a manner to be hereinafter described.

. 'l'he dome is provided externally with oppositcly disposed wings or cats 28, which may be of any suitable shape but in the present instance are substantially semicircular and are formed by out-turned portions of the dome. The ears incline or lead in the same direction and provide opening 29 in the dome, and while but two cars: are shown it is to be understood that a greater number may be employed.

An intermediate collar 30 loosely carried by the shaft bears against the outer surface of the dome and is adapted to be moved along the shaft, in one direction by the cup and in turn serves to restore the cup to its normal position in a manner to be described. To the collar 30 is connected a yoke comprising a stem 31 and arms 32 which straddle the shaft and are suitably pivotedto the pins 3.3 oppositely secured in t is collar. it is to be understood that the yoke is disposed laterally to the shaft, as shown in Fig. 1.

The chamber is rovidcd with a bracket 34 by means of whic 1 it may be fastened to a support 35, such as the dashboarc of a vc hicle, and on the side opposite thereto carries an annular casing 36 integral therewith and at an angle to the support.

A fixed sleeve 37 extends through the cas ing at one side of the shaft '13 and opens into the chamber and into the space. profixed thereto and into which the stem 31 extends. A contractile spring 41 is secured at one end to the rack arm and at its other end to a bracket 42. Therack arm meshes with a pinion 43 which is secured to a shaft 44, one end of which is suitably journaled in the casing 10 as at 45 and the other reduced end passes through a bracket 46 fixed on the casing 10 and carries a'hand or pointer 47 adapted to indicate the speed of t 10 vehicle.

Agraduated dial 48 such as shown in Fig. 8 is mounted upon the posts 49 to which it is secured by sgrews 50 and thus closes the open end of the annular casing, the shaft 44 passing therethrough as shown. A glass front 51 is suitably secured to the annular casing to protect the dial face and the hand.

The operation of 'my device may be described as follows: The casing 10 is filled with oil or other suitable fluid and the head sectircd therein. The driving shaft 13 receives its motion from the axle of the vehicle to which the device is attached by any suitable connections, and as the shaft is rotated it is obvious-that the finger contacting with the roller also rotates the cup and the oil is forced by the cars into the cup through the openings 29and compressed within the cup and the headed or closed annulus. By reason of the cup telescoping with the headed annulus the cup is substantially closed there by andthe oil prevented from escaping while being compressed. It is clear that the faster the driving shaft is rotated the greater the compression of the oil. As the oil is com pressed it bears against the inner wall of the cup in its effort to escape and forces the cup along the driving shaft in the direction away from the head. The collar 30 which contacts with the dome of the cup and the yoke carried thereon are likewisemoved along the driving shaft, the stem of the yoke thus rotating the shaft 38 towards the yoke, As the shaft 38 is thus rotated the rack arm is moved against the action of the spring in the direction of the arrow (Fig. 3), the hand as shown in Figs. 3 and 8 moving from left to right. As the s eed rotation of the driving shaft is reduce the spring 41 returns the rack-arm to its normal position, and it is obvious that the shaft 38 and the collar 40 are thus likewise rocked to their normal position'to move the collar 30 and cup along the driving shaft to their normal position. It is to be understood that the-cup when in its extended position remains within the annulus. The expansive action of the oil compressed '1 between the cup and'lieaded annulus is sufupon its associated hearing or roller 21, and

also by the oblique or propeller like action of the wings against the oil or other llu'id in the chamber.

llaving described my invention what I claim as new and desire to secure by Letters Patent is 1. ln a device of the class described, a liquid-containing chamber, a shaft therein, a cup mounted on the shaft, a dial, a pointer on the dial, connections between the pointer and cup, and means to cause the cup to move longitudinally on the shaft as the latter revolves. g

2. In a device of the class described, a liquid-containing chamber, a driving shaft therein, a cup mounted on the shaft and having openings, wings on the cup at the openings, a dial, a spring-pressed pointer on the dial, a shaft connecting the pointer and the cup, and means to move are cup with the driving shaft as the latter revolves.

3. In a device of the class described, a

liquid-containing chamber, a driving shaft therein, a cup having lateral wings providing shaft as the latter revolves.

4. In a device of the class described, a liquid-containing chamber, a driving shaft therein, an annulus in the chamber, a cup on the shaft telescoping with the annulus, wings on the on providing openings therein, means on tie shaft to rotate the cup as the shaft is driven, a dial, a spring-pressed pointer on the dial, and connections between the pointer and the on 5. In a device of tie class described, a liquid-containing chamber, a driving shaft therein, a cup having wings providing openings mounted on the shaft, an annulus in the chamber with which the cup telescopes, a

bearing on the cup, an arm on the shaft having an obliquely disposed finger engaging the l therein, an annulus in the chamber, a cup mounted on the shaft telescoping with the annulus and having ears providing openings,

a roller on the cup, an arm on the shaft havcollar, a dial,'a pointer on the dial, a rack position.

spring connected tothe rack-arm against the which is adapted to return the parts to their eroaoa ing an obliquely disposed finger engaging the roller, a collar on the shaft and adapted to be moved by the cup, a yoke pivoted on the arm adapted to move the pointer, a shaft connecting the rack-arm and the yoke, and means to return the parts to their normal 7. In a device of the class described, a liquid-containing chamber, a driving shaft therein, a cup one the shaft having ears providing openings and adapted to be rotated by the latter, an annulus in the chamber with which the cup telescopes, a dial, a rack-arm and pinion, a pointer on the pinion, connections b8bWe8Ili1hQ-I&Ck a1m and cup, and a action of which the rack-arm is moved and,

noriffal position. v

8. In an indicator, a liquid-containing chamber, a driving shaft therein, a dial, a pomteg on the dial, a pair of telescoping elements in'the chamber, one of said elements being stationary and the other movable by the shaft to put the liquid under pressure and connections between the said movable element andsaid pointer.

,9. In'an indicator, a liquid containing chamber, a-graduated indicating device, a cup movably mounted in the chamber and having means to force the liquid into the cup to move the same,.and connections between the cup'and indicating device.

'10. In an indicator, a liquid 7 containing chamber, a graduated indicating device, a' pair of telescoping members in the chamber, means to rotate one of the members, said rotating member having means to put the liquid under pressure between the said 40 members, and connections from one of the members to the indicating device.

11. In an indicator, a liquid containing chamber, a graduated indicating device, a movable cup in the chamber, an annulus-in the chamber foiming a closure for the cup,

said cup having means to compress the liquid therein to movethe cup, and connections between the cup and indicating mechanism. In testimony whereof I afiix my signature in presence of two witnesses.

. Donn MILLER. Witnesses;

.C.G(M0Rosnitre, Erirzannrn Mormon. 

